Lifting jack



LIFTING JACK Filed Oct. 1924 2 Sheets-Sheet "any 17. House J}:

Patented Feb. 11, 1930 HENRY A. HOUSE, 33-, F BUFFALO, NEW YORK LIIFIING JACK Application filed Getobei: 4, 1924-. Serial 1T0. 741,706.

This invention relates to an improvement in a lifting-jack, and more particularly to-a jack of the double lift type having a long range.

The popularity of balloon tires for motor vehicles has presented many complications with reference to the useof the single lift typeof jack customarily supplied as a part of the equipment for motor vehicles. V hen the 1 motor vehicle is equipped with balloon tires,

the distance between the ground and the axle when the tire is deflated is reduced two or, in Thls reduction some cases, three inches.

makes it impossible to use a jack of the old type because it has not sufficient range to permit it to be inserted below the axle.

The primary object of this invention is to provide a jack which, in the lowered, position, can be inserted without difliculty below the axle of a car equipped with either balloon,

semiballoon or standard tires and having a range sufficient to permit raising the axle as high as, or higher above the ground than it can be raised by the usual single lift type of 5 jack. 1

r A further object of this invention is to provide a jack with a pedal'so that the shoe can be raised or lowered by the application of the foot to the pedal, the pedal being at such a distance from the main portion of the jack that the springs, bumpers, spare tires or other appurtenances ordinarily carried at the front or rear of the motor vehicle will not in any way interfere with its operation.

Another object of this invention is to provide a jack, the base of which is so formed that it can beremoved from beneath the car easily without the necessity of first lowermg the shoe. 7

Other objects will appear from a consideration of the following description taken in con nection with the drawings which form a part thereof, and in which Fig. 1 isaside elevation partly in section of a liftingjack embodying one form of this invention; p

Fig. 2 is a plan view of the lifting ack taken partly in section along the line 22 of Fig. 1; i

Fig. 3 is aside elevation similar lZQFlg. 1

raised.

The outer ends of the legs 21 of the lift 12 are with parts broken away to show the details of the lifting mechanism;

Fig. 4 is an end elevation the primary lift being shown fully extended and the secondary lift being shown partly extended;

*ig. 5 is a sectional View taken line 5'5 of Fig. 3;

Fig. 6 is an enlarged sectional view taken along the line 6 -6 of Fig. 1;

Fig. 7 is a sectional view taken along the line 77 of F ig. 6; and

Fig. 8 is a side elevation of the pedal.

Referring to the drawings the ack oomprises a pedestal 10 which carries a primary lift 11 and a secondary lift 12, these lifts be ing so formed that the primary lift telescopes into the secondary lift when the parts are in the closed position. The lifts are actuated by a pedal 13 pivotally mounted in a support 14, which is held at a fixed distance from the pedestal 10 by means of a tube 15. A rod 16 enclosed by the tube 15 transmits the movement from the pedal 16 to the lifts through the mechanism set forth hereinbelow.

Secured to the top of the primary lift 11 is a shoe 17 of the usual type, which engages the under sideof the axle or other article tobe Along adjacent sides of the lift 11 are provided rows of teeth 18, 19 by which the lift is raised and held in any desired position, as will be pointed out hereinbelow. V

The secondary lift 12 is preferably U- shaped, as shown in Fig. 2, to provide a center recess or chamber 20 within which the priinary lift 11 is mounted for reciprocation.

along the provided with teeth 22 which are parallel to and in the same plane as the teeth 19 of the primary lift 11. It will be noted, however, that the teeth 22 do not extend to the top of the lift 12 for reasons that will appear later. The lifts 11 andr12 areraised by means of a pawl 23 which engages the teeth 19 of the lift 11 or the teeth 22 of the lift 12. This pawl 23 is pivotally mounted upon a pin 24 9 supported between right angle levers 25,which extend at either side of the pawl 23, and which are mounted upon a pin 26 fixed in the pedestal 10. The upper ends of the levers 25) are connected by a bar 27, with which t e 10 inner end of the rod 16 engages. A spring 28 fixed at one end to the pawl 23 and at the other end to the pedestal 1O normally holds the nose 29 of the pawl inengagement with the teeth 19 or 22.

The inner end of the rod 16 is provided with a hook 30, which can be removably brought into engagement with the pin 27 between the levers 25. As pointed out above, the rod 16 extends through the tube 15 to the support 14 for the pedal 13 which pedal is preferably one arm of a lever 31 pivotally carried upon a pin 32 in the support 14. The other end of the lever 31 is forked and carries between the forks a pin 33 with which the outer end of the rod 16 engages.

The rod 16 is preferably threaded at its outer end to receive a sleeve 34 having a hook 35 which is slipped over the pin 33 when the parts are in the operating position. Surrounding the sleeve 34 is an annular plate or washer 36, which is larger than and rests against the outer end of the tube 15 to form a support for the outer end of the rod 16. The rod 16 is normally held in this position by means of a coil spring 37, which surrounds the rod, hearing at one end against a washer 38 pinned on the rod and on the other end against a washer 39, which bears a ainst a depression 40 formed in the tube 15. The provision of the washer 36 and the spring 37 causes the parts to assume normally the position shown in Figs. 1 and 3 with the pedal 13 in the full line position and the nose 29 of the pawl 23 in engagement with the teeth 18 or 22.

Upon the application of pressure to the roughened end 41 of the pedal, it will be shifted into the dotted line position, the rod 16 will be retracted and the levers 25 turned on the pin 26 to raise the pawl 23, and tans elevate the lift with which the nose 29 is held in engagement by the spring 28. This movement compresses the spring 37 and upon removing the pressure from the end 41, the spring will act to return the pedal to the full line position and bring the pawl 23 back into engagement with the teeth below the one with which it had previously been in engagement.

This general movement of the pawl is old and well-known and need not be set forth in greater detail.

The support 14 is preferably hollow and cut away at 42 to provide a slot through which the pedal 13 extends. In order to limit the movement of the pedal, suitably formed stops 43, 44 are provided at each end of the slot 42. The tube 15 is externally threaded at its outer end to receive a union 45, which engages a threaded boss 46 on the support 14. The washer 36, which supports the rod 16, is located between the end of the tube 15 and the boss 46, so that when the union 45 is tightened, the washer is rigidly held in position. The upper portion of the support 14 and the top of the boss 46 are cut away for a purpose to be described later.

To the inner end of the tube 15 is secured a forked extension 47, the arms 48 of which are spaced a suificient distance apart so that they extend at each side of the pedestal 10 (see Fig. 2). On the outer face of the pedestal 10 preferably in alinement with the pin 27 are provided projections 49 in the form of semi-circular seats, in which rest bosses 50 on the arms 48. The ends of the arms 48 extend upwardly and are provided with recesses 51 through which projects a pin 52, which is removably inserted throughsuitably formed holes 53 in the pedestal 10. These recesses 51 are made appreciably larger than the pin 52, as will appear from a consideration of Fig. 1 to allow for any unevenness of the ground on which the pedestal 10 and the support 14 rest.

That portion of the pedestal 1O engaged by the arms 48 comprises parallel separated walls 54 between which the levers 25 are located.

In order to hold the lift 11 in any desired relation to the lift 12 there is provided a pawl mechanism which is mounted upon and carried by the lift 12. This mechanism is enclosed, when the lift 12 is lowered, within a casing 55 on the pedestal, and comprises a pawl 56, which under the influence of gravity, engages at all times one of the teeth 18 of the lift 11. The pawl is pivoted upon a pin 57 carried by ears 58 on the lift 12. The secondary lift 12 is held in its desired position by means of a pawl 59 pivotally mounted upon a pin 60 secured to ears 61 projecting from the rear face of the pedestal 10. The pedestal 10 is cut away at 62 between the cars 61 in order to permit the pawl 59 to engage with teeth 63 on the lift 12. On the pawl 59 is provided a projection 64, which when the pawl is raised by the movement of the lift will strike against the lift and prevent the pawl from swinging on the pin 60 away from the lift 12 to such an extent that it will not fall back into engagement with the teeth 63 under the force of gravity.

It will be noted that portions of both the pawls 56, 59 project beyond the supporting ears so that they can easily be raised manually when it is desired that the lifts 11 and 12 return to their normal positions. The pawl 23 is provided with a projection 65 which rests between the walls 54 and permits a manual raising of the pawl out of engagement with the teeth of the lifts when desired. The base of the pedestal 10 is provided at its outer ends with a curved nose 66, on which the jack can be tilted to release it from the axle, by raising the actuating mechanism.

Thelift 11is made U-shaped, as will appear from Fig. 2, the recess being closed at the bottom 67. Projecting into the recess from the lift 12 is a pin 68 which is engaged by the hottom 67 when the lift 11 has been raised nearly to its upper limit of reciprocation in the lift 12. Preferably this engagement takes place when the pawl 23 is in mesh with the next to the bottom tooth 19 so that when the lift 11 is raised to the limit the lift 12 will also be raised by the pin 68, and the upper teeth in the rows 22 will be engaged by the pawl 23 upon its next actuation.

. The secondary lift 12 is provided with a similar recess 69 closed at the bottom 7 0 into which recess projects a pin 71 carried by the wall of the pedestal 10. The purpose of this is to limit the upward movement of the secondary lift.

. The operation of the jack may be briefly 1 stated as follows: Consider the lifts 11 and 12 both in their lowest position enclosed within the pedestal 10. As pointed out above, and shown in Fig. 5, the teeth 22 terminate below the upper edge of the lift12,the upper tooth in each row being normally below the nose 29 of the pawl 23 so that when the parts are in position above mentioned, the nose 29 engages only the teeth 19 of the lift 11. By actuating the pedal 13 in the manner previously set forth, the lift 11 is raised until. it nearly reaches itsupper limit. At that point, the pin68 on the secondary lift 12 strikes againstthe bottom 67 of the lift 11, and when the pawl engages the lowest tooth 18, the lift 11 raises the lift 12 so that on the next and later movements of the pawl 23, the nose 29 engages the teeth 22 on the secondary lift. The pawl 56 functions to hold the lift 11 in position so that it cannot telescope into the lift 12 as the latter is raised by the pawl 23.

When the axlehas been raised to the dis tance required and the operations desired have been completed the jack is removed from A below the axle by lifting the pedal 13 and i its support 14, thus bringing one side of the notches 51 in the arms 48 against the pin 52 and causing the jack to tilt as a unit on the nose 66 of the pedestal 10. This movement of the jack forces the car to move a slight.

distance along, suflicient to release it from the jack and to be supported once more on its wheels. The jack is now drawn out from under the car and the secondary lift is first allowed to return to its lowest position under its own weight by manually retracting the pawls 23 and 59. After this is done the pawl 23 is held in the retracted position and the pawl 56 is retracted, thus allowing the lift 11 to return under its own weight into the pocket 20 in the secondary lift 12.

When assembled for operating the jack is too long and cumbersome for easy storing away in the tool kit or under the seat of a motor vehicle. For this reason the parts have been so formed that they can easily be disassembled. This is done by first separating the actuating elements from the pedestal by withdrawing thepin 52. When this is done, the tube 15 is lifted out of the seats 49, and the rod 16 is raised out of engagement with the pin 27. The tube 15 and rod 16 are now separated from the support 14 by backing off the union 45 and lifting the rod 16 away from the pin 33. Since the walls 54 are separated and the top of the boss 46 and support 14 are cut away these operations can be quickly and easily performed. The jack can be quickly reassembled when needed for use, the union 45 and the pin 52 acting to hold the parts firmly in position when the jack is in use.

While one embodiment of this invention i has been shown and described, applicant is not limited thereto, since it is obvious that other embodimentscan be made without departing from the spirit and scope of this inventionas set forth in the following claims.

Having thus set forth my invention what I claim as new and for which I desire protection by Letters Patent is:

1. A lifting jack comprising a pedestal, a primary lift and a secondary lift supported by said pedestal, a single pawl for raising said primary lift and then raising said primary and secondary lifts simultaneously, stop mechanism carried by said secondary lift for holding said primary lift in the raised position, stop mechanism carried by said pedestal for holding said secondary lift in the raised position, a pedal for actuating said pawl, a support on which said pedal is pivoted, means for locating said support at a fixed distance from said pedestal, and means for transmitting the movement of said pedal to said pawl, said locating means being secured to said support and said pedestal and said transmitting means being connected to said pedal and said pawl. i

2. A lifting jack comprising a pedestal, lifts in said pedestal, mechanism including a pawl in said pedestal for raising said lifts, a pedal, a support on which said pedal is pivoted, a tube secured to said pedestal and said support, and a rod in said tube connecting said pedal and said mechanism, whereby said support is suitably spaced from said pedestal and said pawl including mechanism is actuated by the movement of said pedal.

3. A lifting jack comprising a pedestal, a lift therein adapted to be raised for elevating an article, a pawl for raising said lift, means for actuating said pawl projecting from one side of said pedestal comprising a tube having a forked extension at one end, the fork arms thereof extending at each side of the pedestal and a rod in said tube adapted to be reciprocated longitudinally to operate said pawl, a pin removably mounted in said pedestal above said arms, and a nose on the base of said pedestal at the side opposite said actuating means whereby upon lifting said means bodily the arms ofsaidextension will bear against said pin and tilt the pedestal on said nose to release it from the elevated article.

4. A jack comprising a pedestal, a lift supported by said pedestal, said lift having teeth along one side, right angle levers pivotally mounted in said pedestal, a pawl carried by said levers at one end thereof, and adapted to engage the teeth in said lift, a spring to hold said pawl in engagement with the teeth, a bar connecting the other ends of said levers, a rod mounted for rectilinear reciprocation, a hook at the end of said rod which-engages said bar whereby the reciprocation of said rod oscillates said levers and the pawl carried thereby and causes the latter to raise said lift. and means for actuating said rod.

5. A jack comprising a, pedestal, a lift supported by said pedestal, said lift having teeth along one side, right angle levers pivotally mounted in said pedestal, a pawl carried by said levers at one end thereof, and adapted to engage the teeth in said lift, a spring to hold said pawl in engagement with the teeth, a bar connecting the other ends of said levers, a rod mounted for rectilinear reciprocation, a hook at the end of said rod which engages said bar whereby the reciprocation of said rod oscillates said levers and the pawl carried thereby and causes the latter to raise said lift, means for actuating said rod, a tube having a forked extension through which said rod passes, the forks of said extension extending at each side of said pedestal, and removable means for holding said extension in such position.

6. A jack comprising a pedestal, a lift supported by said pedestal, said lift having teeth along one side, right angle levers pivotally mounted in said pedestal, a pawl carried by said levers at one end thereof, and adapted to engage the teeth in said lift, a spring to hold said pawl in engagement with the teeth, a barconnecting the other ends of said levers,

' a rod mounted for rectilinear reciprocation,

a'hook at the end of said rod which engages said bar whereby the reciprocation of said rod oscillates said levers and the pawl carried thereby and causes the latter to raise said lift, means for actuating said rod, a tube having a forked extension through which said rod passes, the forks of said extension extending at each side of said estal, bosses on the inner faces of said orks, seats on said pedestal in which said bosses rest, and a pin removably inserted through said edestal above said seats, the ends of said pin projecting above said forks and preventing their removal.

;7. A 'ack comprising a pedestal, a lift suplwrted y said pedestal, said lift having teeth along one side, right angle levers pivotally mounted in said pedestal, apawl carried by said levers at one end thereof, and adapted to engage the teeth in said lift, a spring to hold said pawl in engagement with the teeth, a bar connecting the other ends of saidlevers, a rod mounted for rectilinear reciprocation, a hook at the end of said rod which engages said bar whereby the reciprocation of said rod oscillates said levers and the pawl carried thereby and causes the latter to raise said lift, means for actuating said rod, a tube having a forked extension through which said rod passes, the forks of said extension extending at each side of said pedestal, bosses on the inner faces of said forks, seats on said pedestal in which said bosses rest, the upper edge of each fork being provided with a recess and a pin removably inserted through said pedestal, the ends of said pin projecting through said recesses to prevent the removal of said forks from said seats.

8. A lifting ack comprising a pedestal, a lift therein adapted to be raised for elevating an article, mechanism including a pawl for raising the lift, removable and pivotally mounted means for actuating said mechanism, a pin removably mounted in the pedestal for normally holding said means in actuating engagement with the mechanism and which pin the actuating means will contact upon being pivoted and a nose on the base of said pedestal at the side opposite said actuating means whereby upon pivoting said means into contact with said pin, the pedestal will be tilted on said nose and release itself from the ele vated article.

In testimony whereof I have affixed my signature.

I-IENRY A. HOUSE, JR. 

